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Annual CSO and Consent Decree Reports
King County prepares an annual report on its combined sewer overflow (CSO) control program for the Washington State Department of Ecology (Ecology).
These reports are required under the National Pollutant Discharge Elimination (NPDES) permit for King County’s West Point Treatment Plant in Seattle and WAC 173-245-090.1.
In 2013 King County signed an agreement with the Environmental Protection Agency (EPA) and the Washington State Department of Ecology. This agreement, called a “consent decree” also requires an annual report. With the agreement of EPA and Ecology the two annual reports are consolidated into one. This report meets the consent decree, state, and federal requirements.
| 2022 Annual CSO and Consent Decree Report | 2022 CSO Annual Snapshot |
| Report Contents | Appendices |
|---|---|
| 1.0 Introduction | A Untreated CSO Events, January–December 2022 |
| 2.0 Programs to Meet EPA’s Nine Minimum Controls | B Treated CSO Events, January–December 2022 |
| 3.0 Control Status of CSO Locations | C Alki Wet Weather Treatment Station 2022 Annual Report |
| 4.0 CSO Control Measures Currently Underway | D Carkeek Wet Weather Treatment Station 2022 Annual Report |
| 5.0 Summary of Rainfall and CSO Events | E Elliott West Wet Weather Treatment Station 2022 Annual Report |
| 6.0 Summary of Consent Decree and NPDES Violations in 2022 | F Henderson/MLK Jr. Way Wet Weather Treatment Station 2022 Annual Report |
| 7.0 Post-construction Monitoring |
Annual reports for previous years